Add a comment to explain the fork return values on sparc64
Add a comment to explain the fork return values on sparc64

raulgrell/zig,andrewrk/zig,raulgrell/zig,raulgrell/zig,raulgrell/zig,raulgrell/zig,andrewrk/zig,zig-lang/zig,zig-lang/zig,zig-lang/zig